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Jia L, Xu H, Xu X, Gao K, Zhao K, Dong J, Su N. GmMYB114 Facilitates the Synthesis of Anthocyanins in Soybean Sprouts under Blue Light. PLANTS (BASEL, SWITZERLAND) 2024; 13:1107. [PMID: 38674516 PMCID: PMC11055127 DOI: 10.3390/plants13081107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Revised: 03/30/2024] [Accepted: 03/30/2024] [Indexed: 04/28/2024]
Abstract
Soybean sprouts constitute a significant segment of the vegetable market due to their nutritional richness, particularly in various flavonoids, which contribute to numerous health benefits. The augmentation of the flavonoid content in soybean sprouts is pivotal for enhancing their economic value. While research has established the potential of blue light in promoting the synthesis of anthocyanins, a subclass of flavonoids known for their health advantages, the precise regulatory mechanisms remain elusive. In this study, we identified a notable upregulation of an R2R3 type MYB transcription factor, GmMYB114, in response to blue light exposure, exhibiting a significant positive correlation with anthocyanin accumulation in soybean sprouts. The functional role of GmMYB114 was validated in soybean hairy roots, wherein its overexpression substantially augmented anthocyanin synthesis. Further investigations employing yeast one-hybrid (Y1H), dual-luciferase reporter (LUC), and GUS assays revealed that GmMYB114 indirectly influences anthocyanin synthesis as it does not directly bind to the promoters of anthocyanin synthesis genes to activate their expression. These findings contribute to elucidating the mechanism underlying blue light-mediated enhancement of anthocyanin synthesis in soybean sprouts, offering valuable insights for harnessing molecular technologies to obtain anthocyanin-enriched soybean sprouts.
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Affiliation(s)
- Li Jia
- College of Food and Drug, Luoyang Normal University, Luoyang 471934, China;
- College of Life Science, Nanjing Agriculture University, Nanjing 210095, China; (X.X.); (K.G.); (K.Z.); (J.D.)
| | - Hong Xu
- College of Science, Minzu University of China, Beijing 100086, China;
| | - Xinxin Xu
- College of Life Science, Nanjing Agriculture University, Nanjing 210095, China; (X.X.); (K.G.); (K.Z.); (J.D.)
| | - Kai Gao
- College of Life Science, Nanjing Agriculture University, Nanjing 210095, China; (X.X.); (K.G.); (K.Z.); (J.D.)
| | - Keying Zhao
- College of Life Science, Nanjing Agriculture University, Nanjing 210095, China; (X.X.); (K.G.); (K.Z.); (J.D.)
| | - Jingran Dong
- College of Life Science, Nanjing Agriculture University, Nanjing 210095, China; (X.X.); (K.G.); (K.Z.); (J.D.)
| | - Nana Su
- College of Life Science, Nanjing Agriculture University, Nanjing 210095, China; (X.X.); (K.G.); (K.Z.); (J.D.)
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Niu M, Chen X, Guo Y, Song J, Cui J, Wang L, Su N. Sugar Signals and R2R3-MYBs Participate in Potassium-Repressed Anthocyanin Accumulation in Radish. PLANT & CELL PHYSIOLOGY 2023; 64:1601-1616. [PMID: 37862259 DOI: 10.1093/pcp/pcad111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 08/30/2023] [Accepted: 09/19/2023] [Indexed: 10/22/2023]
Abstract
Anthocyanin biosynthesis in plants is influenced by a wide range of environmental factors, such as light, temperature and nutrient availability. In this study, we revealed that the potassium-repressed anthocyanin accumulation in radish hypocotyls was associated with altered sugar distribution and sugar signaling pathways rather than changes in oxidative stress status. Sugar-feeding experiments suggested a hexokinase-independent glucose signal acted as a major contributor in regulating anthocyanin biosynthesis, transport and regulatory genes at the transcriptional level. Several R2R3-MYBs were identified as anthocyanin-related MYBs. Phylogenetic and protein sequence analyses suggested that RsMYB75 met the criteria of subgroup 6 MYB activator, while RsMYB39 and RsMYB82 seemed to be a non-canonical MYB anthocyanin activator and repressor, respectively. Through yeast-one-hybrid, dual-luciferase and transient expression assays, we confirmed that RsMYB39 strongly induced the promoter activity of anthocyanin transport-related gene RsGSTF12, while RsMYB82 significantly reduced anthocyanin biosynthesis gene RsANS1 expression. Molecular models are proposed in the discussion, allowing speculation on how these novel RsMYBs may regulate the expression levels of anthocyanin-related structural genes. Together, our data evidenced the strong impacts of potassium on sugar metabolism and signaling and its regulation of anthocyanin accumulation through different sugar signals and R2R3-MYBs in a hierarchical regulatory system.
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Affiliation(s)
- Mengyang Niu
- College of Life Sciences, Nanjing Agricultural University, No. 1, Weigang, Xiaoling Wei Street, Xuanwu District, Nanjing, Jiangsu 210095, China
| | - Xuan Chen
- College of Life Sciences, Nanjing Agricultural University, No. 1, Weigang, Xiaoling Wei Street, Xuanwu District, Nanjing, Jiangsu 210095, China
| | - Youyou Guo
- College of Life Sciences, Nanjing Agricultural University, No. 1, Weigang, Xiaoling Wei Street, Xuanwu District, Nanjing, Jiangsu 210095, China
| | - Jinxue Song
- College of Life Sciences, Nanjing Agricultural University, No. 1, Weigang, Xiaoling Wei Street, Xuanwu District, Nanjing, Jiangsu 210095, China
| | - Jin Cui
- College of Life Sciences, Zhejiang University, No. 866, Yuhangtang Road, Xihu District, Hangzhou, Zhejiang 310027, China
| | - Lu Wang
- School of Environmental and Life Sciences, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia
| | - Nana Su
- College of Life Sciences, Nanjing Agricultural University, No. 1, Weigang, Xiaoling Wei Street, Xuanwu District, Nanjing, Jiangsu 210095, China
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Yang K, Hou Y, Wu M, Pan Q, Xie Y, Zhang Y, Sun F, Zhang Z, Wu J. DoMYB5 and DobHLH24, Transcription Factors Involved in Regulating Anthocyanin Accumulation in Dendrobium officinale. Int J Mol Sci 2023; 24:ijms24087552. [PMID: 37108715 PMCID: PMC10142772 DOI: 10.3390/ijms24087552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 04/10/2023] [Accepted: 04/15/2023] [Indexed: 04/29/2023] Open
Abstract
As a kind of orchid plant with both medicinal and ornamental value, Dendrobium officinale has garnered increasing research attention in recent years. The MYB and bHLH transcription factors play important roles in the synthesis and accumulation of anthocyanin. However, how MYB and bHLH transcription factors work in the synthesis and accumulation of anthocyanin in D. officinale is still unclear. In this study, we cloned and characterized one MYB and one bHLH transcription factor, namely, D. officinale MYB5 (DoMYB5) and D. officinaleb bHLH24 (DobHLH24), respectively. Their expression levels were positively correlated with the anthocyanin content in the flowers, stems, and leaves of D. officinale varieties with different colors. The transient expression of DoMYB5 and DobHLH24 in D. officinale leaf and their stable expression in tobacco significantly promoted the accumulation of anthocyanin. Both DoMYB5 and DobHLH24 could directly bind to the promoters of D. officinale CHS (DoCHS) and D. officinale DFR (DoDFR) and regulate DoCHS and DoDFR expression. The co-transformation of the two transcription factors significantly enhanced the expression levels of DoCHS and DoDFR. DoMYB5 and DobHLH24 may enhance the regulatory effect by forming heterodimers. Drawing on the results of our experiments, we propose that DobHLH24 may function as a regulatory partner by interacting directly with DoMYB5 to stimulate anthocyanin accumulation in D. officinale.
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Affiliation(s)
- Kun Yang
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yibin Hou
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Mei Wu
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Qiuyu Pan
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yilong Xie
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yusen Zhang
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Fenghang Sun
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Zhizhong Zhang
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Jinghua Wu
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002, China
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